Simply uninstall progeCAD 2010 completely from the first PC, then re-install & activate progeCAD on the new PC using the same license code.
Registration process is exactly like the first. You can re-activate your license automatically online and finish. If your new PC is not connected to the internet, you will have to re-activate progeCAD 2010 manually using the "email" method which saves a "Registration.cad" file to the desktop. Copy this file over to a PC with email and send it to the address indicated inside this file.
progeCAD support, tips and troubleshooting forum. progeCAD works very similar to some versions of AutoCAD. Moderated.